Car-door-operating device.



W. V. TURNER & W. M. CADY. CAR DOOR OPERATING DEVICE.` APPLICATION man APR. 15, 1916.

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WALTER V. TURNER, 0F WILKINSBURG, AND WILLIAM CADY, 0F EDGUEWOOD, PENN- SYLVANIA, ASSIGNORS T0 THE WESTINGI-IOUSEAIR BRAKE COMPANY, OF WILMER- DING, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

CAR-DOOR-OPERATING DEVICE.

Specicatcn of Letters Patent.

Patented Feb. 12, 1918..

" Application filed April 15, 191s. serial No. 91,282.

To-all whom t may concern:

Be it known that we, WALTER V. TURNER, and WILLrAM M. CADY, citizens of the United States, residing at, respectively, Wilkinsburg and Edgewood, inthe county oAlleUhen'y, State of Pennsylvania, have jointly invented va certain new and useful Improvement` in Car-Door-Operating ,Devices, of which the following is a specification. i

This invention relates to door and step operating devices, and Vmore particularly as applied to vehiclesoperated in electric traction service and the like.

"The principal object of our `invention is to provide an improved fluid operated door and step controlling device employing a Y minimum number of parts and adapted to be cheaply manufactured. j

In the accompanying drawing, the single figure is a diagrammatic view, partly in section, of a car equipment for controlling the doors and steps and embodying our `invention. i

According to the drawing, a` so-called double ended equipment is illustrated, in which the car can be controlled from either end and comprising a motormans brake valve l, at each end of the car, an automatic brake pipe 2,` a straight air pipe 3, an emergency valve device `4, connected by pipe 5 to brakeA cylinder 6, and a main reservoir 7, connected bypipe 8 to said emergency valve device.

Accordin to our invention, a door and step operating cylinder 9 is provided, one for controlling the car doors and steps at each end of the car and within each cylinder is mounted a ditlerentialpistoncomprising a large head 10 contained in chamber 11 connected by pipe l2 to the brake valve 1, and a small piston headl3 contained in piston chamber 14, which is connected by pipe l5 directly to the main reservoir 7. A rack bar 16 connects the piston heads 10 and 13, the teeth of the rack bar being adapted to engage the teeth of a pinion 17 through the operation of which the car doors and steps are controlled.

The emergency valvedevice 4 may be of a type heretofore employed and comprising a piston 18 contained in piston chamber 19 connected to emergency brake pipe 2 and a valve 20, contained in valve chamber`2l and adapted to be operatedby the piston 18 upon a sudden reduction in emergency is supplied to and released from the straight air pipe 3, which is connected in the normal release position of the valve 2() through passage 22, cavity 23, and passage 24 with brake cylinder 6.

The type of brake equipment shown is known as the two-pipe system, in which the fluid is supplied from the main reservoir and the emergency valve device to the emergency brake pipe for normally maintaining said brake pipe charged and in which the emergency brake pipe is `connected to the rotary valve chamber of the brake valve, so that fluid for controlling the brakes by straight air isl derived from the emergency brake pipe, so as to do away with the necessity for an additional supply pipe to the brake valve.

In the normal running position of the brake valve l, port connections are made for supplying Huid through pipe l2 to piston `chamber 11, and as desired, similar connections can be made in other positions ot' the brake valve when it is desired to hold the doors and steps closed.

In operation, iiuid `under pressure is constantly supplied to the piston chambers 14 of the door operating cylinders, and with the brake valve l in running position, or other position in which the doors are to be closed, fluid is also supplied to the larger piston chamber l1, so that the unbalanced fluid pressure acting therein, will operate to hold the dierential piston device in the position shown in the drawing :tor closing the car doors and steps.

IVhen it is desired to open the car door, the brake valve`1 is turned to a position in which fluid is vented from piston chamber 11, so that the iuid pressure constantly present in piston chamber 14 operates to shift the differential piston tothe position for opening the car door.

In a double ended equipment, it is desirable or necessary to maintain the door closed at the end of the car remote from the operating end, especially on cars operated and controlled by one man, and for this purpose, a restricted port 25 is provided in the rotary valve 2G of the brake valve l, which is adapted to register with passage 27 leading to pipe l2 in thehandle ofl4 position of' the brake valve.

It will now be seen that when the inotorman leaves one end of the car, as Yhe turns fthelbrake halve' to handle off .position, so that the brake valve handle can be removed, a connection is made for supply ing fluid through pipe l2 to the piston chamber ll of the door operating cylinder Vat each end of the car, so that the car doors and'steps will be opened automatically. The port 25 is preferably made restricted, so as to require a certain period of time for the escape of fluid from the pistonchamber l1, since this Will alloiv time for the car to come to a stop by the applying of the brakes.

V before the car doors Will open.

It Will noiv be noted that the equipment herein described does not require the use of eXtra. valves for controlling the supply offluid to the door operating cylinder and by means of a single pipe to the brake valve, the doors and steps can be opened and closed at will as Well as automatically in case of an emergency. Y v

It will be understood that the invention is adapted for single end equipments as well as double end equipments, the construct-ion and operation being substantially thesame, except that only one door operating cylinder and one brake valve device is employed.

Having now described our invention, ivhat We claim as new and desire to secure by Let-l ters Patent, is: Y y

1.111 a car door and step controlling device, the combination with a` piston device constantly subject on one side to fluid under pressure for operating the car doors and steps, a brake pipe, a reduction in pressure in which is adapted to effect an application of the brakes, and means 'for connecting the bra-ke pipe to the opposite side 'of said piston device.

2. In 4a car door and st'ep controlling device, the combination ivith a piston device for operating the car ydoors and steps and having differential ,piston heads, the smaller 'piston head being constantly subject to fluid under pressure, of an emergency brake pipe, a reduction in pressure in which is adapted tceffect an application of the brakes and a brake valve device for normally "supplying fluid from the emergency brake pipe tothe larger piston head of said pistondevice.

3. In a car door andy step controlling de` vice, the combination With` a. piston device for operatingthe car doors and steps and having differential piston heads, the smaller piston head being constantly subject to fluid under pressure, of an emergency brake pipe normally charged with fluid under pressure, a valve device for effecting an application of the brakes upon areduction in brake pipe pressure, and a brake valve devicenormally under pressure, of an emergency brake Apipe* normally charged with fluid under pressure, ay valve device forrefl'ecting an application of' the brakes upon a reduction in brake pipe pressure, and a brake valve device normally suppling fluid from the emergency brake pipe through a restricted port to the larger piston head of said piston device. y i

lIn a car door and stepcontrolling de'- vice, the combination with a piston device for operating the car doors and steps and having differential piston heads, the smaller head being constantly subject to fluid under pressure,of a brakey valve device for supplying fluid to the larger pistonhead Ain ythe handle off position.

6. In a car door and step controlling device, the combination With alpiston device for operating the car doors andsteps and,

havingdifl'erential piston heads-,the smaller piston hea'd lbeing'constantlyV subject to fluid;

under pressure, or' an emergencybrake pipe and a brake valve device adapted in handle off position for supplying flu-1d from the emergency brake pipe to the larger piston iis 7. In a car door and step controlling dehead of' lsaid piston device.A

vice, the combination with va piston :device for operating 'thecar doors and, steps and having Vdifferential piston heads, the smaller piston head being constantly subject to fluid under pressure,` of an emergency brake pipe' and a` brake valve device adaptedin handle off position for supplying Vfluid from the emergency brake pipe through a restricted port to the larger piston head of said piston device. Y

8. In a `ear door` and step controlling de-I vice,the combination Witha 'piston device operated by supplying fluid to one side 'for closingthe car ldoors and steps, 'of a brake valve device adapted to supply iuid to said piston device in running and handle off positions.

9. The combination with a main reservoir, a brake valve device, a brake pipe adapted to be charged from the main reservoir independently of the brake valve device, and an emergency valve device operated upon a reduction in brake pipe pressure for effecting an application of the brakes, of a piston device for operating the car doors and steps and subject on one side to main reservoir pressure and on the opposite side to fluid supplied from the brake pipe through said brake valve device.

l0. The combination with a `main reservoir, a brake valve device, a brake pipe adapted to be charged from the main reservoir independently of the brake valve device, and an emergency valve device operated upon a reduction in brake pipe pressure for effecting an application of the brakes, of a piston device having di'erential piston heads for operating the car doors and steps and having. one piston head constantly subject to main reservoir pressure and the other head to Huid supplied from the brake pipe through said brake valve device.

In testimony whereof We have hereunto set our hands.

WALTER V. TURNER.

WILLIAM M. CADY.

Gope of this patent may be obtained for ive cents each, by addressing the Commissioner of Patente,

Washington, ID. C. 

